Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edd40cd9f692ec3bcfbcc688426ad834f6e6a7f15bb6e300278d3314a5bd4cb4' 
  AND token = 'za9HnFXXjQGN3W4idOY51uyxK0k+GN7IbMV3Cy+i9Pg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}